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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92fcf2afa864a04e6bd54616e60ceb735b5882114a4b1b606d2d22affd85868c' 
  AND token = '+CdhEvSujoXmDb1qHGCZSFL4ps3gAsQ7de3l67uTBcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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