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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f96f10401be64521e075857807f4ad30232d24a5adf5567fd32a81fffbff6bd7' 
  AND token = 'bYKpdjaySQFGbzbbdWqA5vB3WyoRdqytuxOK+I8rO/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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