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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbf93ba1b30316fb88083d20cece3cb0ccf78c2ad8648b16f0c682dbeb27d941' 
  AND token = 'UwsgnuXoLeHqZ7aVfXnzSGhqHZibIhnQyvUmwgjNRbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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