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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2303222357a9a330090068e22ed784a7850cff435690be3ed9d238b98f5c1af5' 
  AND token = 'iN37Nf87K0NosPvzTP/cbWtvu+GPn7ikF/s/u4KKu4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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