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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2d00a5cb81293e245e8cc5e1c49de97e32fbbef500c22056ff52a54134b8d6' 
  AND token = '2uCjycvXoU+orXA9trySCXd33x4h108uunSHPuOsD24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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