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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc5eead73282979222eba958c88d2588baeec37881fb2c6ff878db6353d0cb25' 
  AND token = '+XKKn5BhRT3MmaAIq7/C0d5lfQrHIwjB4NxLa94uzF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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