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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7ff4853a9ca0de747d18161b5dadb071a46b1ebecedbb317d7c7e23029cb72e' 
  AND token = 'atFo6x2BFOK3N0plVa4S36JePqGoM8pN++j9rgs0Mn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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