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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd44cfe1a1578d9b54fb46d231da098e9e8d39c56cae828c01ae0b3292eba22bc' 
  AND token = 'N2EGdPS7EfWiLKePvNAON1bi0i52HGv8I8kSH5i+emc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}