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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f8b454cdae92c72e277fc89bfaa27167cfef6cc3958ca73f7f9825bc24ac2b1' 
  AND token = 'wy6yGWUYz6m9htXrlQfGnsb6cfsUz3JAoE9cfSt9fjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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