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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020b435be1e18320933fe2618fdd1c1d1af7614e8654f365cca52841f1e03084' 
  AND token = 'tmY12pltycy9f9qrOby9ldr8EGpZbirDNsgEvkdsr8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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