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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccd352722efaa645552cc9a156979f1c6ee577154e10da1dbe9ab03a9cd67d9b' 
  AND token = 'RAfAVG3c2lycp8lhhcyxuzGt1xdQl4VlR4boortaLiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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