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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af588c7443e923d458fb4d4acf7313c9438aa36451d8615e816ae4f8e0a3c0bf' 
  AND token = 'ODfTrmr5k/G0pc68/VdgPDasyxKNXjSQR7RFK1zA/Pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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