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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d6b36b70a7b2a9012bdf6e5bdae4e88d1959afbfe47b98c9721b6d0c4bdb73' 
  AND token = 'YpOGk8msz8OVQT+E8xxW7533jRtTzdkoODdEzJbk6kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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