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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20d3c19c3aae26df2b8c25e6164edd41965dd6bb1af6c35b56ec2db6c85600d2' 
  AND token = 'WwQK/fvMLlgFJGiJ9Sd0XX5SQEDml5pxL8WCrM7BwDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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