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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f1af7256caf87a73a63bac3b1acff5cd8041f051ae30745b70674645b14d1c' 
  AND token = '3yeir/Oa4gVkZferVCEjniNi7XXKn/O0JKGIHO0l9kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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