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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd7488e24656e8061c983848ec272e1942ed98fbedb507ece96c4436542a04df' 
  AND token = 'XYxLAhVlCRQsWqoC2fKKmQYUd9xGPVrcInW1dPptHZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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