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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9334a23d539839a9199e9c218672c7b2bde3739c1fac675cb2bfb323b3172ed9' 
  AND token = '1Y4yVS0uVzKqXeHS9AtlNoZ7ROsDOLmUCQb3R5gjmoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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