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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3267414a643832fd0e8241981640ddab52d4924b341931bdd5238a394eebeb00' 
  AND token = 'kyEVGtfAcc6cTr2/bzdhrv+HOA7x+X6zDYche+OsxdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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