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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce7716887d00933feb2e5351eb2baef3af5a25dfec68bcfc1916f209ce9b6cdb' 
  AND token = 'vkxCRYTc4KprCu7gY7asRaxoUfShUw51JeBhrDvE9tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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