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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f9bc0dda6ca0ef1afd7f635c9f0799ad9d9eb45e655b93b34509211234161fe' 
  AND token = '04A/GmzvKy3McNoFP1U6N77oCINENxXVzAwPpsJyI7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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