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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8ac14a7940b3e96b8da216af133b6879b95603f26adb5cca90a8918a2f2e35d' 
  AND token = '0fBzBbOpHfMrp9JJtTYzHJYtLm/FirSxpn07U3tkMtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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