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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc7e0764fc96dc06acc9687a6b2b5bd37984bc3fefe54376d78003e55e6f95ae' 
  AND token = 'H60lgY2ExxNEy1jd2+wV49ocvO9S5DNAsToFEf57728=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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