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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f0e2994d8bf360d5b3db5835eff9fe87b546fe4ed8a83f99f850ed962f1971f' 
  AND token = '/FknMvtzE0uuO787cOwVGwhSIW+nUeUcyxFjRmhZe3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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