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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cae7c5aa16ff6ea2bc7fe995d429448f2fa18f217d621597105ab4bad8b1fa0f' 
  AND token = 'LQFruXy6hCBZ9STE3S/Lb/p/lguT6YJwaaQTHkmHYY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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