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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb8e12d488c08fb4f99f8e6f3505a2711e3ec6144d8e21a3d7cf8afea9a54acd' 
  AND token = 'ac6f4aWBJMaa2q2vgMouP43j6fpiHqCfacDNVW6FzvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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