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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35ec85943fc39c01d7150e0f435b581d551228495a6b7f4c21bbdf5f0da569a5' 
  AND token = 'y9JS9rG+oU4FgasEyXO/42S4SFHgM/Mav+663D2uMZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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