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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da5993d601e9db144ee458c1c785f62d0382a4408a6de5d6d7a63e9dd11d85cc' 
  AND token = 'eOTRz4pg6a6UeaUEi/Nfi0J8pCe9hnDb9ttcJWQXxQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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