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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb5fee7ebb62695a5013cd310e2e38539a09b195c79b5016a83509e880e7b6f5' 
  AND token = '+5Iu72iK5EPpxC9K1sUVcncCw1N7M54cnDODb8II+SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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