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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd13d3b8a211ec03c6e6c36597c581e3662e1614fc9954dada85138e20560f14' 
  AND token = '8b2NZHolS7mdRC4pzZwrp3MivZMQxy7H1tPbTwTLDYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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