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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ac3d7afdf22eca9285a945c9965b15caef9c7d1c5a23147b2c11210c8d7579f' 
  AND token = 'Or1qYFDFkBXgQ77mmSFFAcv4PVZONjWHgNARqZ4zQhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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