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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bade9ab7b1cd735d780f4d95d63765e8e07f578ebb69bf0efcb9692b16d1b080' 
  AND token = 'ic0CFmzs7iruYi8IGKLRNHkxCLCdr+5NevDKS8Sdf5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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