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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83361a8799c8bfbeffcb51bc8356cd601e5dd612433116a89d05d307b4dd7a39' 
  AND token = 'LtpffvXEgXBjkeyw3lb6XXmKU3F+ot3aW1nSN63BCds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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