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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29470c3a55edbdd271814dac6b0cd8fad2a448940a3a4f29c12cbb7a440a4aa5' 
  AND token = 'MWMOqoDRkZOIcVku95J8a/7YibhFRwTrAH6ga0qMkpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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