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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833ba867223b56d38d25a885be66072fd44d89267e38615d1d96a86a75798207' 
  AND token = 'kvxOwH821uz3d1JSGA1/RYlkQ7005JP3cy2+xBNJlJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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