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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '855cf3cf0f295a1afea7b38e3cf8499d0d975de51fdaf15c5590422975baf614' 
  AND token = 'MLssrhr8Poqyxh6FewA7Gcm4cMvvhvl89ksE99rwuPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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