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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fa3a8f1bf230963e1247ef827e3251d40cd9b8d44b59b4b0e22c062901d9749' 
  AND token = 'q2R2i7sarKz7l4l/zGSFtGXZXU3T75oTFNl09fryNy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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