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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fef63955067ff62780bc18dea4f8be3ccf33341b05a6cea84e732bfe7c7b48ca' 
  AND token = 'wrHARpcqpTsuYF8uOmVPwRm0e6KxpvoeYQF34bXbYDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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