SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd0bfc79d3eb6a63ad5844ee822c1f6509751150ae65879b4cdc3aa23e0ca75' 
  AND token = 'n4v7flXJzj1Zb3DgCDxqWwWgjrIXJBlIA/pC1nDrQNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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