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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a905177d836c07cb091b3935cd49ea29965ef2900284b6c5c72c08acddaa368' 
  AND token = 'UWFrggdLhll59I7sx/jwovw7Zr3lWZvqcXm+PQI7wHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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