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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eadb53958194581421032fdc2e7f86bf94e9d1413d875c1d2c228bde63d4e47' 
  AND token = 'R0VNC1SVxTGjuRiOcxgTG17Q/9o+vQRogTj+9WknS8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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