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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b14ad5a93d9dc05691eaf85c030fbe0925863343ba3fc271cf8b2f0c4b54b4d5' 
  AND token = 'ooICoLJMzI1TG8D6SjpAjzpge8oeGvpWTo3dXcD1rqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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