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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dc11be23a836274517fc1662f26580fed9f2fff8d94bdd4f57893fff4473dbf' 
  AND token = 'q9IcYkBGH0y7jl4HREFx6u7u+csR0hu5UJB4HuZ/pkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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