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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3d5e94f54909861d30a43118f455aad856eb3c1cd9f636d94957e0587e33d01' 
  AND token = '5LxX5jE2PCJhMsOKkyOX55qbBFuVHYiD7S7yADpmv7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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