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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '311be7c7a4d36b030c9e6ee95e6054b529dd9bc28869b711d5b551a92bf8b8a7' 
  AND token = 'fcHTKrkGdTNxLl/NUkDaA04ITKuO/adbU/ZpDL3YfoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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