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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7f58ef79a67bc6bd9d880e93303ca2e9a83febefcd7930a6cc4c3bb36f416e' 
  AND token = 'nd1sTi6vDxrbkc3z4v2q0S6YckXrwrktHIa2VQaU1Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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