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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '314b3cd460dc43f232551a89cbbcb1ce21940d2e4e31fc7b78c5817157ed8435' 
  AND token = 'bP0ouHfWvx+OYyi1E7tIhIbDo9S2CfUAfuOchYfNSxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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