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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2de61f10641d86f791cfa9ddc66acb74f27f78c30ec00c15a85f3661adcb6a6b' 
  AND token = 'hNFJYgtB2FvDCuhfLMZjQ5bK1jZ4Nk1LW0hADe7boAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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