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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adebffca879d3989f290cb7eb1ad690b4eb3bb67fac1446139c456d8fb0e77bf' 
  AND token = 'mEHYLtZtTFqLcQOXsE65MaQzN6fLnPqRx6CxKfHTbak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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