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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f50121415ecdaf38ecd5550b64cf85fbb2e48426a77078c750594124fcf0766' 
  AND token = '/2HjVnge5MZlxU1EW42fckjO7ENPfprlBg0+qwJRjeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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