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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f465b69feee74434f3e599475abfb4d95bf460988cee6c384dcdc637a721faa' 
  AND token = '76wv9HkNGHenuZ00zyEI5NQHPy+XcxHyGkbcHrqu6A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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