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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1a7588d286644a61d6912cbafb838fc5293537d46617a3f7039c43af5a45330' 
  AND token = 'Wrgr6Rpe0Xs5zVMDJ0Ls4Ud6g9SJxOOsicR02e/YSkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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