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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff7daec389f4f71e1bd6bb23766c015adb6f274618dc61e311e7a763e47a88b0' 
  AND token = 'ySnxjLZf66TOkvjGYYBDvy8KDmViCcRbM0ffGguLz/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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