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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '517f7ceb570cd7400a0dcc09d8d34cab129819d062bdce776523028ecb1d0864' 
  AND token = 'TQVf/gkuANSjxYP36Tk9IBcU/w54CmkQh9G3A2PaZgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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