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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb3308af0a8b388e6fae85d8280a6a1639dcbf89a51df3707135eefb2198d883' 
  AND token = 'hp1vL1idyuXuwfULEZxbR9HC4nmrawmBrJ7NJs6Bmtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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