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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40ed33430422417a42b04060b5b211715f0a7eecfa14a227e534fa87d4aa97f7' 
  AND token = 'cGfAst5yCOp8o0Ht6lsOX12m/pIltOiEYAqQerHArj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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