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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34e324562b75ca3d144c1845a97d4d31a04e13eab783b1510b693c655f0906ad' 
  AND token = 'xN+g+ahSrFvT0u0E77wYFU10iHPVogsm8+1UCuMuQRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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