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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26dcbe5680d8ba81ffbdf833db63b43345f360aef9269f7c790e3e8f6638da05' 
  AND token = '9cQuh5o21gc5gf3itPuUqsCHpPDM7EVq4tRe/m+YUns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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