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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c77445b1b2ecfdfb860e0506207e245d79666d52ea8d834af75fa3c92d7ea2' 
  AND token = 'kXtG7TmRLUaN4KBQs3gJqjoe8sDG4crvojVFrNreV2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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