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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaead523b9d34d77addbf2a3815950ca2d83f54a2a048f04ec8ef1723155439b' 
  AND token = '2p53IvygV5ZmAT0ucv2qFbYE576+01cFL38SxtnrAVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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