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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99cc91c7b34bc3a2f2463a36cafb1b0bdeb1bb523236f478185b739087a080ad' 
  AND token = 'Ny7P6CDJjuCBEUpijUw0kiCGDXw/yQlPxUzdf8TPrzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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