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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51f095a83673fa69ef974af553707e9a93719b8cc26f3ba02565d434894706ea' 
  AND token = 'G9hpVDikdn221sU20qOVIW03fGusKmvYMgARdS34A+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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