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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '840af9ebd21e9d1ca438292d13ebfee5ab75243a1edda37912685be118ca4a67' 
  AND token = 'fYajFJJPYvu9YtQ7R61u9FfH14mFiW/iu4HjOFsfFIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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